We demonstrate a novel sensor capable of detecting small refractive index change of liquids using single microfiber. The sensor is based on the principle of optical heterodyne frequency modulation technique and is used to measure the variation of refractive index with concentration of glucose in distilled water. Our experimental results show that the device exhibits the capability of measuring an index variation of ~ 10~5. The stability of the sensor, high sensitivity and the simplicity of the design, low cost of fabrication, compact size, and easy integration with optoelectronic devices, make it suitable for chemical, biomedical, pharmaceutical and process control applications.
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